问题 单项选择题

A plane traveled k miles in the first 96 minutes of flight time. If it completed the remaining 300 miles of the trip in t minutes, what was its average speed, in miles per hour, for the entire trip ?()

A.A

B.B

C.C

D.D

E.E

答案

参考答案:A

解析:

考生在做此题时,一定要注意单位的一致,先算出以英里/分钟为单位的平均速度,再把此速度乘以60。该飞机飞行的总距离为k+300英里,总时间为(96+t)分钟,所以根据题意可得其整个旅程的平均速度为[*]。

单项选择题
单项选择题